Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ef92bbbcd6aeeb…

MALICIOUS

PDF

62.3 KB Created: 2021-09-13 13:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67ec840e142440f46e7fdc534cda1bd0 SHA-1: fe1f6150f2861963a79cf1049f250a8a32c5b4b7 SHA-256: 36ef92bbbcd6aeeb521b2536dba42178b5e389bc7bc4f5b3528f7160ff9cb542
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm intended to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8176

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mertlakustika.cz/images/pages/file/lesutulupewa.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613159297582b---penopivoxivevanorix.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6240d476713b304c32fc5f42cd7e09cd/35346264234.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56166635897.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/xokerudenizojikefidusegu.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/puzikabizobotasirale.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6vu06falct0a80o92dm2dkg1qj/serixajedoroxelo.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/puwugonifatefodenefu.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/23918173642.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/xibozavatasirov.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2560af79d---zujolebokavaregeri.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/90809309569.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/zaberisosugedaferuxefig.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/suxutejel.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/nixudavorozagezepawazo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/zovonumogavemi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/83880577263.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/xonoragidavegufuwiwi.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/pugifipufofimoje.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/85865168905.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/newakubinevuxesul.pdfIn PDF document text
    • http://myphamasia.net/upload/files/femomixuxuzarofitodit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gold+hack+wot+blitzPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE2 10380 bytes
SHA-256: afb703815e9330771a675d1dacd1038a6cefc39b29f4439bc738a5bf71c565b5
font_01_sfnt_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 17336 bytes
SHA-256: 73ad80fddc6d5536100dae3fb1510e98af6dd9432b3528bf2d9640c531dda61c

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